A Novel Very Low Bit Rate Multi-ChannelAudio Coding Scheme Using AccurateTemporal Envelope Coding and SignalSynthesis Tools

摘要

Multichannel audio is increasingly ubiquitous in consumer audio applications such as satellite radio broadcastsystems; surround sound playback systems, multichannel audio streaming and other emerging applications. Theseapplications often present challenging bandwidth constraints making parametric multichannel coding schemesattractive. Several techniques have been proposed recently to address this problem. Here we present a novel low bitrate five channel encoding system that has shown promising results. This technique called the Immersive SoundfieldRendition (ISR) System emphasizes accurate reproduction of multi-band temporal envelope. The ISR system alsoincorporates a very low over-head (blind upmixing) mode. The proposed multichannel coding system has yieldedpromising results for multi-channel coding in 0-12 kbps range. More information and audio demos are available athttp://ww.atc-labs.com/isr.